Assuming the first example is the correct one as far as the status value goes, I'd code it this way.
Update:tweaked it a bit.
sub bar {
my($self) = @_;
my $rv = { status => 0, error => undef, external_id => undef };
$rv->{ error } = "Authentication Failed" and return $rv
unless $self->authenticate_user();
my $profile = $self->get_user_profile();
$rv->{ error } = "User is not active" and return $rv
unless $profile->is_active();
$rv->{ external_id } = $self->find_external_id( $profile ) //
$self->send_profile_to_partner( $profile );
$rv->{ status } = 1;
return $rv;
}
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